Normally, one discount code is only applied for one offer. However, If the users put a vast of items in their cart, it is easy to use one coupon code to purchase items. It depends on Sucuri's policy, you can contact Sucuri via mail for your reference.

It depends! Normally, the percentage that you can save with that Sucuri Coupon will be shown right on the page, so you can see if it is applied sitewide or not. However, once you are not sure, try it right on their's products you want to buy.

Usually, Coupon Stacking is not allowed at Sucuri. However, the store will surely give out notice if available.

At the time of updating, Sucuri has not applied Student Discount all year round yet. Check the official store and reach out to the customer support team to be clear.